ucode: update to latest Git HEAD

ucode: update to latest Git HEAD

c6dae42 LICENSE: add ISC license file
402f603 lib: introduce struct library
dcb6ffd struct: fix PowerPC specific compiler pragma name
a0512ea treewide: fix typo in exported function names and types
eaaaf88 nl80211: fix wiphy dump reply merge logic
e6efadb fs: add utility functions
54ef6c0 nl80211: fix premature netlink reply receive abort
07802f3 syntax: disallow keywords in object property shorthand notation
3489b75 vm: support object property access on resource value types
dc8027c types: consider resource prototypes when marking reachable objects
5680fab treewide: fix upvalue reference type name
0d29b25 treewide: fix "resource" misspellings
99fdafd vm: introduce value registry
66f7c00 ubus: add support for async requests
5c77dd5 fs: implement fdopen(), file.fileno() and proc.fileno()
b605dbf treewide: rework numeric value handling
599d233 vallist: store double values in a platform neutral manner
5bb9ab7 struct: reuse double packing routines from core
2fd7ab5 vm: optimize string concatenation
eafa321 lib: implement uniq() function
6b2e79a types: add initial infrastructure for function serialization
725bb75 compiler, vm: use a program wide constant list
6c2caf9 source: refactor source file handling
371ba45 program: implement support for precompiling source files
3578afe build: support building without compile capabilities
61d0a34 lib: replace usages of vasprintf() with xvasprintf()
03b6a8e syntax: drop legacy syntax support
01132db lib: fix %J string formats with precision specifier
3f44c42 lib: rework format string handling
a1b3c5d struct: implement `*` format, fix invalid memory accesses
34a04a2 run_tests.sh: fix exitcode evaluation
abe38e7 run_tests.sh: add ability to define environment variables for testcases
04fa2ba tests: reorganize testcase files
6a55d10 lib: fix exists() error return value
aa860a3 vm: fix `null` loose equality/inequality checks
3f6d199 vallist: uc_number_parse(): parse empty strings as `0`, not `NaN`
ddc5aa7 vm: fix NaN strict equality tests

Signed-off-by: Jo-Philipp Wich <jo@mein.io>